Solar power harnessed efficiently: Tandem solar cells reach 33.1% efficiency thanks to textured silicon surface treatment
In a significant stride towards renewable energy, researchers have achieved a breakthrough in perovskite tandem solar cells. This development, led by Dr. Oussama Er-Raji, a scientist at Fraunhofer ISE, brings perovskite silicon tandem solar cells one step closer to commercial reality.
The research team, consisting of international members, has found a way to enhance the efficiency of these solar cells. The key lies in texturing the silicon surface with pyramid shapes, which increases the surface area, capturing more sunlight.
The breakthrough involves effective passivation on the textured perovskite surface using 1,3-diaminopropane dihydroiodide. This passivation technique, when applied to textured silicon bottom cells, would allow tandem cells to fit into existing production lines, making mass production more feasible.
The study, published in the prestigious journal Science, also revealed a difference in how passivation behaves across materials. In silicon, passivation acts only at the surface, while in perovskite, it impacts the entire absorber layer, boosting conductivity and improving fill factor. This deep field effect in perovskite further improved the overall performance of the solar cells.
The research builds on the Fraunhofer lighthouse project MaNiTU and the projects PrEsto and Perle, funded by the Federal Ministry for Economic Affairs and Energy. Despite the advancements, the names of the scientists who experimented with the passivation of textured silicon in perovskite-based tandem solar cells remain unspecified in the available search results.
Surface passivation of solar cells is essential for their efficiency and stability. The new approach resulted in a conversion efficiency of 33.1 percent with an open-circuit voltage of 2.01 volts. This breakthrough in perovskite tandem solar cells relies on perovskite to boost light absorption, while silicon remains vital due to its mature production methods.
Tandem solar cells, with their ability to absorb a broader spectrum of sunlight, have the potential to revolutionise the solar industry. This latest breakthrough brings us one step closer to harnessing this potential and making clean, sustainable energy more accessible.
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